Abstract
Abstract High-temperature oxidation behaviour of Mo-40Ti-30Si (at.%) alloy was investigated in the temperature regime of 900-1300∘C in air. Isothermal weight change data recorded up to 100 h of exposure revealed parabolic weight gain kinetics at all the tested temperatures. The protective oxide scale composed with SiO2 (silica) and TiO2 (titania) forming a duplex oxide microstructure consisting of TiO2 particles embedded in the continuous SiO2 matrix. The oxide scale showed parabolic growth kinetics, and the activation energies for the scale growth were found to be 72.2 kJ/mol in 900-1200∘C and 324.9 kJ/mol in 1200-1300∘C. The kinetics of the protective scale growth on the alloy surface was mainly controlled by the growth of the silica film and the inward diffusion of oxygen through the duplex oxide layer.
Highlights
High-temperature oxidation resistance and room temperature fracture toughness are the two key issues to be resolved for developing molybdenum based materials [1, 2] to replace nickel based superalloys used in energy producing devices operated at high temperatures
High-temperature oxidation behaviour of Mo40Ti-30Si alloy was investigated in the temperature regime of 900-1300∘C in air
The protective oxide scale composed with SiO2 and the duplex SiO2 (TiO2) forming a duplex oxide microstructure consisting of TiO2 particles embedded in the continuous SiO2 matrix
Summary
High-temperature oxidation resistance and room temperature fracture toughness are the two key issues to be resolved for developing molybdenum based materials [1, 2] to replace nickel based superalloys used in energy producing devices operated at high temperatures. Molybdenum shows linear oxidation behaviour when exposed to. The detailed oxidation behaviour of Mo-40Ti-30Si (in at.%) system was studied in a. This work is licensed under the Creative Commons Attribution wide temperature regime of 900-1300∘C in static air. The weight change behaviour of the alloy was recorded. The cross-section of the oxide scale was analysed using SEM and EDS. The growth kinetic of the oxide scale was evaluated. The superior oxidation resistance of the alloy was understood using microstructural observations and thermodynamic considerations
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